9th Edition

ISBN: 9781259822674

Author: Yunus A. Cengel Dr., Michael A. Boles

Publisher: McGraw-Hill Education

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Chapter 10.9, Problem 37P

Steam enters the high-pressure turbine of a steam power plant that operates on the ideal reheat Rankine cycle at 800 psia and 900°F and leaves as saturated vapor. Steam is then reheated to 800°F before it expands to a pressure of 1 psia. Heat is transferred to the steam in the boiler at a rate of 6 × 10⁴ Btu/s. Steam is cooled in the condenser by the cooling water from a nearby river, which enters the condenser at 45°F. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the pressure at which reheating takes place, (b) the net power output and thermal efficiency, and (c) the minimum mass flow rate of the cooling water required.

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Chapter 10.9, Problem 36P

Chapter 10.9, Problem 38P

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Steam enters the high-pressure turbine of a steam power plant that operates on the ideal reheat Rankine cycle at 800 psia and 900 °F and leaves as saturated vapor. Steam is then reheated to 800 deg F before it expands to a pressure of 1 psia. Heat is transferred to the steam in the boiler at a rate of 6x104 Btu/s. Steam is cooled in the condenser by the cooling water from a nearby river, which enters the condenser at 45 °F. Show the cycle on a T-s diagram with respect to saturation lines. Determine also the following: the pressure at which reheating takes place, the net power output and thermal efficiency, and the minimum mass flow rate of the cooling water required. A. 741.0 Ibm/s, 39.4%, 62.23 psia B. 641.0 Ibm/s, 49.4%, 62.23 psia C. 641.0 Ibm/s, 39.4%, 62.23 psia D. 641.0 Ibm/s, 39.4%, 72.23 psia

In a Rankine cycle with reheating, the steam leaves the boiler at 2.5 MPa and 600 ºC and enters the high pressure turbine where it expands to a pressure of 1 MPa to be then subjected to a reheating process from where it leaves at 1 MPa and 600 ° C. The steam at these conditions enters the low pressure turbine and expands up to the condenser pressure of 50 kPa. The heat that is extracted in the condenser is 1500 kJ / s. If the adiabatic efficiency of the turbines and the pump is 95%, determine the total heat flow in kJ / s delivered to the boiler.

Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500°C and is cooled in the condenser at a pressure of 7.5 kPa. Determine the thermal efficiency of the cycle. The thermal efficiency of the cycle is 59.6 %.

Chapter 10 Solutions

Thermodynamics: An Engineering Approach

Ch. 10.9 - Why is the Carnot cycle not a realistic model for...Ch. 10.9 - Why is excessive moisture in steam undesirable in...Ch. 10.9 - A steady-flow Carnot cycle uses water as the...Ch. 10.9 - A steady-flow Carnot cycle uses water as the...Ch. 10.9 - Consider a steady-flow Carnot cycle with water as...Ch. 10.9 - Water enters the boiler of a steady-flow Carnot...Ch. 10.9 - What four processes make up the simple ideal...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...

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Solution Summary: The author explains the pressure at which reheating takes place.

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